Inside the Sequence Operation State. Figure l-39 illustrates the operation of the sequence operation state.

The downward entrance to the Sequence Operation State signals that some instrument dependent action should begin at once. An upward exit is not allowed until the instrument signals that its action is complete. Note that complete can be defined differently for different instruments. For example, consider an instrument that can sweep a range of frequencies starting with fr and ending with fi. The action-complete signal can be defined to coincide with the output of either fr or f2.

Common Trigger Configurations

Figure l-39. Inside the Sequence Operation State

In the previous paragraphs, you learned about the basic building blocks allowed in a SCPI trigger system. Generally, an instrument implements only a portion of the trigger features available. These paragraphs discuss the simplest configurations: INIT and TRIG. ”

The INIT Configuration

The INIT configuration is the simplest possible trigger configuration. It uses no event detection states, and requires only two subsystems for programming, INITiate and ABClRt . All SCPI instruments implement these two subsystems

Getting Started Programming l-109